Transient episodes of magma injection in silicic volcanoes | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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Tectonique et mécanique de la lithosphère

  Transient episodes of magma injection in silicic volcanoes

Transient episodes of magma injection in silicic volcanoes: assessing the stress state in shallow magma reservoirs at Cordon Caulle and Yellowstone volcanoes: 

The largest explosive eruptions on Earth are composed of silica-rich magmas such as rhyolites, but there is little understanding of the processes that lead to such eruptions as only a handful of these occur every century. In his post-doc, Francisco Delgado will study magma transport and storage dynamics in two of these restless silicic magmatic systems, Cordon Caulle and Yellowstone, both with spectacular episodes of ground deformation although with different characteristics. He will use satellite observations of ground deformation from Interferometric Synthetic Aperture Radar (InSAR) as well as multiphysics numerical models. He will construct InSAR time series that span two cycles of ground uplift and subsidence at Yellowstone and three transient pulses of uplift at Cordon Caulle. These data sets will be used as inputs for finite element multiphysics simulations of magma injection where changes in the pressure of a deep source seek to explain the cyclicity of the Yellowstone inflation-deflation events and the transient pulses of uplift at Cordon Caulle. The final goal is to assess if any of these pulses can actually lead to an eruption and if they do not, how many are actually required to reach that threshold. The proposed research will allow us to improve our understanding of the physical processes that lead to unrest in these dynamical systems.